Make Classes Multifaceted

[Velox]

But the presence of Medica II being 1 click away makes it crazy unbalanced. Imagine a 8 man group with 1 tank, 6 Geomancers, and a White Mage. That's 7 Medica IIs every 30 seconds split between that many sources. Completely overpowered.

This has already been done. 7 WHM and 1 Tank is the same thing with 6 of the WHM in Cleric Stance. WHM has plenty of DPS potential in Cleric Stance to pass a lot of the DPS checks in-game. Stone II is something like 500+ (non-critted) and they have access to 2 DoTs that stack.

FFXIV is a casual game, not some hard-core MMO where only certain class combinations can achieve victory. This game has a lot of room for fun group set-ups to allow for some creative strategies to accomplish the same goals. Is it overpowered? Sometimes it is, but at the same time it isn't because these kinds of set-ups are situational. There's a video on youtube of a WHM tanking Titan HM. I mean, all kinds of crazy things can be done in FFXIV. That doesn't mean it's optimal though, as these things come with inherent risks and the possibility of low returns.